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Johnson calls for sanctions against Russia

British Foreign Secretary Boris Johnson says sanctions against Russia should be "considered" amid suggestions the country is committing war crimes in Syria.

Speaking during a visit to a refugee camp in Turkey, he reaffirmed his view that Russia was in danger of breaching international humanitarian law.

Moscow earlier reacted angrily to the "unacceptable" suggestions, which have come from Britain and America, about its role in Syria's bloody civil conflict.

It warned that the comments could harm the US-Russia brokered ceasefire in Syria, as Mr Johnson visited the camp near the border of the war-ravaged nation.

Mr Johnson's visit to the camp around 161km from Aleppo in Syria comes after angry exchanges at the United Nations over the latest offensive by the Russia-backed regime to take the beleaguered city.

Speaking to Sky News, he said: "This is why I think the Russians are in danger of committing war crimes - there's another bomb that comes in, what they call the 'double tap' manoeuvre, and I think that is absolutely unthinkable.

The so-called double tap manoeuvre is when two consecutive missile strikes are fired at a target, the latter of which often risks hitting response teams, aid workers or civilians who have rushed to the scene to help after the first blast.